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We report on a search for continuous gravitational waves (GWs) from NS 1987A,the neutron star born in SN 1987A. The search covered a frequency band of75-275 Hz, included a wide range of spin-down parameters for the first time,and coherently integrated 12.8 days of data below 125 Hz and 8.7 days of dataabove 125 Hz from the second Advanced LIGO observing run. We found noastrophysical signal. We set upper limits on GW emission as tight as anintrinsic strain of $2\times10^{-25}$ at 90\% confidence. The large spin-downparameter space makes this search the first astrophysically consistent one forcontinuous GWs from NS 1987A. Our upper limits are the first consistent ones tobeat an analog of the spin-down limit based on the age of the neutron star, andhence are the first GW observations to put new constraints on NS 1987A.

First Constraining Upper Limits on Gravitational Wave Emission from NS 1987A in SNR 1987A